參數(shù)資料
型號(hào)： LNH6644MAX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 音頻／視頻放大
英文描述： 3V, Low Power, 130MHz, 75mA Rail-to-Rail Output Amplifiers
中文描述： 4 CHANNEL, VIDEO AMPLIFIER, PDSO14
封裝： SOIC-14
文件頁(yè)數(shù)： 18/22頁(yè)
文件大小： 955K
代理商： LNH6644MAX
Application Notes
(Continued)
For this example, optimum C
f
was empirically determined to
be around 5pF. This time domain response is shown in
Figure 4
below showing about 9ns rise/fall times, corre-
sponding to about 39MHz for f
p
. The overall supply current
from the +5V supply is around 5mA with no load.
Printed Circuit Board Layout and Component Values
Sections:
Generally, a good high frequency layout will keep power
supply and ground traces away from the inverting input and
Ordering Information
output pins. Parasitic capacitances on these nodes to
ground will cause frequency response peaking and possible
circuit oscillations (see Application Note OA-15 for more
information). National Semiconductor suggests the following
evaluation boards as a guide for high frequency layout and
as an aid in device testing and characterization:
Device
Package
Evaluation
Board PN
CLC730068
CLC730027
CLC730036
CLC730123
CLC730031
CLC730131
LMH6642MF
LMH6642MA
LMH6643MA
LMH6643MM
LMH6644MA
LMH6644MT
SOT23-5
8-Pin SOIC
8-Pin SOIC
8-Pin MSOP
14-Pin SOIC
14-Pin TSSOP
These free evaluation boards are shipped when a device
sample request is placed with National Semiconductor.
Another important parameter in working with high speed/
high performance amplifiers, is the component values selec-
tion. Choosing external resistors that are large in value will
effect the closed loop behavior of the stage because of the
interaction of these resistors with parasitic capacitances.
These capacitors could be inherent to the device or a by-
product of the board layout and component placement. Ei-
ther way, keeping the resistor values lower, will diminish this
interaction to a large extent. On the other hand, choosing
very low value resistors could load down nodes and will
contribute to higher overall power dissipation.
Package
5-Pin SOT-23
Part Number
LMH6642MF
LMH6642MFX
LMH6642MA
LMH6642MAX
LMH6643MA
LMH6643MAX
LMH6643MM
LMH6643MMX
LMH6644MA
LNH6644MAX
LMH6644MT
LMH6644MTX
Package Marking
A64A
Transport Media
1k Units Tape and Reel
3k Units Tape and Reel
Rails
2.5k Units Tape and Reel
Rails
2.5k Units Tape and Reel
1k Units Tape and Reel
3.5k Units Tape and Reel
Rails
2.5k Units Tape and Reel
Rails
2.5k Units Tape and Reel
NSC Drawing
MF05A
SOIC-8
LMH6642MA
M08A
LMH6643MA
MSOP-8
A65A
MUA08A
SOIC-14
LMH6644MA
M14A
TSSOP-14
LMH6644MT
MTC14
20018565
FIGURE 4. Converter Step Response (1V
PP
, 20 ns/DIV)
L
www.national.com
18
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